| Full bridge inverter with push/pull control chip -> Monitor Keywords |
|
|
  Full bridge inverter with push/pull control chipUSPTO Application #: 20060050543Title: Full bridge inverter with push/pull control chip Abstract: A full bridge inverter with a push/pull control chip uses two similar drivers to connect to the prior art full bridge switch assembly, and controls the prior art full bridge switch assembly with the push/pull control chip. The full bridge inverter comprises a push/pull control chip with two output terminals. Two drivers both have an input terminal and an output terminal. The input terminal is connected to the output terminals of the push/pull control chip and a full bridge switch assembly with four electronic switches. Each electronic switch has a control terminal connected to the output terminal of the two drivers so as to convert DC power into AC power by the two drivers. (end of abstract) Agent: Rosenberg, Klein & Lee - Ellicott City, MD, US Inventors: Chun-Kong Chan, Jeng-Shong Wang USPTO Applicaton #: 20060050543 - Class: 363132000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20060050543. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a full bridge inverter with a push/pull control chip, and more specifically relates to a push/pull control chip controlling the full bridge switch assembly for driving the load. [0003] 2. Description of the Related Art [0004] The primary power supply of the cold cathode fluorescent lamp (CCFL) of the TFT LCD is used with the inverter circuit. The prior art inverter circuit converts DC power into AC power, and is discriminated into half bridge inverter, full bridge inverter and push/pull inverter, for example, by the topology of the different circuits. [0005] Referring to FIG. 1, the transformer T1 divides the whole circuit into a front circuit 101 and a back circuit 102, and there is a push/pull control chip 103 connected between the front circuit 101 and the back circuit 102. The front circuit 101 comprises a DC power, a first switch Q1, a second switch Q2 etc. and the back circuit 102 comprises at least a capacitor (C1, C2, C3), a load, at least a diode (D1, D2) etc. [0006] Referring to FIG. 2, the push/pull control chip 103 transmits a first control signal a and a second control signal b to the first switch Q1 and the second switch Q2, respectively, for switching the two switches. Power is thus supplied to the load through the transformer T1 according to the DC power. The voltage wave c of the secondary of the transformer T1 is the wave of the ac voltage at point C in FIG. 2. [0007] In the above description, the push/pull control chip 103 is chip LX1686 and the series LX1686, LX1688, LX1691 of the LINFINITY (MICROSEMI) Corp., the series of the chip O2-9RR of the O2 Micro International Limited Corp., and the series of the chip BIT3105, BIT3494 of the Beyond Innovation Technology Corp. [0008] As shown in FIG. 3, the transformer T2 divides the whole circuit into a front circuit 201 and a back circuit 202. The front circuit 201 comprises four electronic switches (P1, P2, N1, N2), a full bridge control chip 203 and a capacitor C1. Moreover the back circuit 202 comprises a load. Referring to FIG. 4, the full bridge control chip 203 transmits four control signals (POUT1, POUT2, NOUT1, NOUT2) to the four electronic switches (P1, P2, N1, N2), respectively; by switching those switches, power is supplied to the load through the transformer T2 according to the DC power. The full bridge control chip 203 is the BIT3105 of the Beyond Innovation Technology Corp. [0009] In the above description, driving the full bridge switch assembly requires the full bridge control chip 203 and driving the push/pull inverter requires the push/pull control chip 103, thus lacking practical flexibility. Furthermore, the control chip of the inverter circuit is limited in use so as to be hard to purchase together. SUMMARY OF THE INVENTION [0010] The primary object of the present invention uses two similar drivers to connect between the output terminal of the push/pull control chip and the control terminal of the full bridge switch assembly, and the push/pull control chip controls the full bridge switch assembly for switching. [0011] The present invention is connected between the four electronic switches (P1, P2, N1, N2) of the full bridge switch assembly of the prior art and the push/pull control chip with the two similar drivers. Mcreover, the push/pull control chip controls switching of the four electronic switches (P1, P2, N1, N2) of the full bridge switch assembly through two similar drivers. [0012] In the above description, the driver comprises a first accelerated diode connected to the output terminal of the push/pull control chip with a negative pole terminal and connected to the control terminal of the electronic switch with a positive pole terminal for speedily cutting off the N-MOSFET, a first resistor parallel to the first accelerated diode for restraining the current via the control terminal of the N-MOSFET, a link capacitor connected to the negative pole terminal of the first accelerated diode and the positive pole terminal of a second accelerated diode and thereby the second accelerated diode connected to the control terminal of the P-MOSFET with a negative pole terminal for speedily cutting off the P-MOSFET, a second resistor parallel to the second accelerated diode for restraining the current via the control terminal of the P-MOSFET, a Zener diode connected to a positive pole terminal of the second accelerated diode with a positive pole terminal and connected to the DC power with a negative pole terminal for preventing excessive voltage. A third resistor is parallel to the Zener diode for producing a Zener voltage. [0013] In the above description, the present invention receives the control signals transmitted from the push/pull control chip with two similar drivers for controlling the four electronic switches (P1, P2, N1, N2) of the full bridge switch assembly for switching. [0014] Then the present invention uses two similar drivers to connect to the prior art full bridge switch assembly, and the prior art full bridge switch assembly controlled by the push/pull control chip. The present invention also can use the push/pull control chip to control the push/pull inverter and control the full bridge switch assembly through the two drivers so as to increase the flexibility and the practical worth thereof. BRIEF DESCRIPTION OF THE DRAWINGS [0015] The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which: [0016] FIG. 1 is a circuit schematic diagram of a prior art push/pull inverter driving the load; [0017] FIG. 2 is a wave schematic diagram of control signals of the push/pull control chip and the voltage of the load. [0018] FIG. 3 is a circuit schematic diagram of a prior art full bridge inverter driving the load; [0019] FIG. 4 is a wave schematic diagram of control signals of a prior art full bridge inverter; [0020] FIG. 5 is a circuit schematic diagram of the push/pull control chip controlling the full bridge switch assembly of the present invention; and [0021] FIG. 6 is a wave schematic diagram of control signals of the push/pull control chip and the voltage of the AC power. Continue reading... Full patent description for Full bridge inverter with push/pull control chip Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Full bridge inverter with push/pull control chip patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Full bridge inverter with push/pull control chip or other areas of interest. ### Previous Patent Application: Circuit making use of push/pull-type control chip to drive half bridge-type inverter circuit Next Patent Application: Information recording method, reproducing method, and recording reproducing method utilizing holography Industry Class: Electric power conversion systems ### FreshPatents.com Support Thank you for viewing the Full bridge inverter with push/pull control chip patent info. IP-related news and info Results in 6.09227 seconds Other interesting Feshpatents.com categories: Accenture , Agouron Pharmaceuticals , Amgen , AT&T , Bausch & Lomb , Callaway Golf |
||
